OP
@norman avatar
UTC

Hooked
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 424
Location: Belgium
 
Hooked
@norman avatar
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 424
Location: Belgium
UTC quote
I need to replace the damper on my Motovespa 160GT. One thing I've noticed is that the new damper has the standard Italian tabs on the lower mounting, whereas the Spanish swing arm doesn't have corresponding slots.

My dilemma is whether to keep the scooter original and grind off the tabs on the shock, or cut slots in the original swing arm. What is the purpose of the locating tabs, and why did they remove them on Spanish models?

Any advice greatly appreciated before I break out the Dremel!
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
@finyoshi avatar
UTC

Addicted
Parmakit Primavera -74, Polini Primavera -68, VR-One 228 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: UTC
Posts: 544
Location: Finland
 
Addicted
@finyoshi avatar
Parmakit Primavera -74, Polini Primavera -68, VR-One 228 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: UTC
Posts: 544
Location: Finland
UTC quote
You don't want metal-on-metal rubbing there or the shock bushing to turn open the nut attaching the shock. Tabs keep the shock bushing always in same position along the fork and bolt.

When shock is going up and down, the rubber is flexing instead of metals rubbing.
OP
@norman avatar
UTC

Hooked
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 424
Location: Belgium
 
Hooked
@norman avatar
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 424
Location: Belgium
UTC quote
That makes sense, but I keep asking myself why didn't the engineers make the swing arm with slots in the first place? Surely there's a reason they didn't do it ...
@safis avatar
UTC

Ossessionato
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: UTC
Posts: 4333
Location: Veria, Greece
 
Ossessionato
@safis avatar
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: UTC
Posts: 4333
Location: Veria, Greece
UTC quote
Is there a chance your old shock had some kind of bearing?? I would slot the swing arm since all shocks come with the tubs...
@moto64 avatar
UTC

Molto Verboso
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
Joined: UTC
Posts: 1906
Location: S.Salem, NY
 
Molto Verboso
@moto64 avatar
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
Joined: UTC
Posts: 1906
Location: S.Salem, NY
UTC quote
I just checked my '64 150S and it appears to be the original shock without the tabs and it's firmly in place. I think that having the inner bushing de-tabbed and clamped hard against the boss would fine. Or cut the slots with a Dremel. Maybe someone can provide the orientation.
The only place I have seen a shock bushing keyed to the mount is on a Vespa but the swing arm does move through more of an arc than most cases.
OP
@norman avatar
UTC

Hooked
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 424
Location: Belgium
 
Hooked
@norman avatar
1978 MotoVespa 160GT, 2009 LML Star 2T (Stella), 1961 Lambretta S2
Joined: UTC
Posts: 424
Location: Belgium
UTC quote
Thanks guys, I think I'll cut the slots in the swing arm. Fingers crossed!
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